diff options
| author | Samuel Holland | 2022-02-02 20:17:34 -0600 |
|---|---|---|
| committer | Alexandre Belloni | 2022-03-23 19:58:38 +0100 |
| commit | 7fc46339c33e60218bbb1f542d55da1678919d11 (patch) | |
| tree | c2dd9398e278cab8c07f336ed7e1261c3b42955d /drivers/clk | |
| parent | 43f0269b6b89c1eec4ef83c48035608f4dcdd886 (diff) | |
clk: sunxi-ng: mux: Allow muxes to have keys
The muxes in the RTC can only be updated when setting a key field to a
specific value. Add a feature flag to denote muxes with this property.
Since so far the key value is always the same, it does not need to be
provided separately for each mux.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Acked-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20220203021736.13434-5-samuel@sholland.org
Diffstat (limited to 'drivers/clk')
| -rw-r--r-- | drivers/clk/sunxi-ng/ccu_common.h | 1 | ||||
| -rw-r--r-- | drivers/clk/sunxi-ng/ccu_mux.c | 7 |
2 files changed, 8 insertions, 0 deletions
diff --git a/drivers/clk/sunxi-ng/ccu_common.h b/drivers/clk/sunxi-ng/ccu_common.h index 98a1834b58bb..fbf16c6b896d 100644 --- a/drivers/clk/sunxi-ng/ccu_common.h +++ b/drivers/clk/sunxi-ng/ccu_common.h @@ -17,6 +17,7 @@ #define CCU_FEATURE_LOCK_REG BIT(5) #define CCU_FEATURE_MMC_TIMING_SWITCH BIT(6) #define CCU_FEATURE_SIGMA_DELTA_MOD BIT(7) +#define CCU_FEATURE_KEY_FIELD BIT(8) /* MMC timing mode switch bit */ #define CCU_MMC_NEW_TIMING_MODE BIT(30) diff --git a/drivers/clk/sunxi-ng/ccu_mux.c b/drivers/clk/sunxi-ng/ccu_mux.c index 2306a1cd83e4..1d557e323169 100644 --- a/drivers/clk/sunxi-ng/ccu_mux.c +++ b/drivers/clk/sunxi-ng/ccu_mux.c @@ -12,6 +12,8 @@ #include "ccu_gate.h" #include "ccu_mux.h" +#define CCU_MUX_KEY_VALUE 0x16aa0000 + static u16 ccu_mux_get_prediv(struct ccu_common *common, struct ccu_mux_internal *cm, int parent_index) @@ -191,6 +193,11 @@ int ccu_mux_helper_set_parent(struct ccu_common *common, spin_lock_irqsave(common->lock, flags); reg = readl(common->base + common->reg); + + /* The key field always reads as zero. */ + if (common->features & CCU_FEATURE_KEY_FIELD) + reg |= CCU_MUX_KEY_VALUE; + reg &= ~GENMASK(cm->width + cm->shift - 1, cm->shift); writel(reg | (index << cm->shift), common->base + common->reg); |